The demo was recorded on a modified version of PrBoom written by Budko himself. This version was the base for PrBoom+. The main feature of his custom version not present in the original PrBoom is the ability to activate permanent strafe50. All versions of PrBoom include slow-motion recording and save states, the latter of which Budko used sparingly. [1]

Budko's run eclipsed the March 2000 tool-assisted record of 16 minutes, 17 seconds by Marijo "Sedlo" Sedlic in 30uv1617. This was achieved by taking advantage of newly-discovered routes and tricks, and the use of the strafe50 modification.

Improvement

30uv1441 is not a maxed-out speedrun. On the Doomworld forums in January 2004, Budko announced the possibility of recording an updated Doom II speedrun with a running time under 14 minutes, but never did it.